Choosing between plaster and drywall comes down to how you want your space to perform and how quickly you need the work done.
Both materials are commonly used on commercial and residential jobs across Adelaide. Drywall is the go-to for fast, cost-efficient fit-outs. Plaster is chosen when durability, finish quality, and long-term performance are the priority.
Here’s how they actually compare so you can make the right call for your project.
What Is Plaster?
Plaster is a traditional building material made from gypsum, lime, or cement mixed with water to create a thick paste. It is applied to walls and ceilings, then hardens into a solid, smooth surface ready for finishing.
On commercial buildings, plaster is used in offices, retail spaces, hotels, and medical facilities where appearance and performance both matters. It adds real value through fire resistance, sound control, and a solid wall feel that drywall can’t replicate.
It’s also the right call on Adelaide’s heritage buildings, where matching existing wall systems and architectural detail is part of the brief.
What Is Drywall?
Drywall is a modern wall and ceiling lining made from a gypsum core sandwiched between two layers of heavy paper. In Australia, it’s usually called plasterboard or Gyprock, and it’s now the standard material used in most commercial and residential buildings. It creates smooth interior surfaces without the need for traditional wet plaster work.
On commercial fit-outs across Adelaide, drywall is the standard. Offices, retail stores, warehouses, and hospitality spaces rely on it because it goes up fast and keeps projects on schedule. For business owners, less time on site means less disruption and a faster handover.
It also comes in specialised types, such as fire-rated, moisture-resistant, and acoustic boards, which makes it adaptable across a wide range of commercial applications.
Read More: Choosing the Right Plaster Finish for Your Project
Differences Between Plaster and Drywall
Here’s how they compare in the areas that matter most on Adelaide commercial and residential jobs.
Durability and Strength
Plaster forms a dense, solid surface once it sets. It holds up well against knocks and daily wear, which is why it’s still common in high-traffic commercial spaces, medical facilities, and premium interiors across Adelaide where walls need to last decades without maintenance issues.
Drywall is strong within a framed system but not as impact-resistant. In busy environments like offices, retail stores, and schools, it can dent or crack if struck hard enough.
Winner: Plaster is more durable, especially for commercial spaces
Installation Time and Labour
Plaster involves multiple wet layers that each need time to set before the next coat goes on. On large commercial fit-outs, that adds time and can push back handover dates.
Drywall goes up fast. Sheets fix directly onto framing and joints are finished shortly after. No waiting for coats to cure. For businesses in Adelaide, this means less disruption and faster handover to tenants or staff.
Winner: Drywall is the more practical choice if your project has a tight deadline
Cost
Drywall is the more affordable option, especially on large-scale commercial jobs. Materials and installation cost $15 to $30 per square metre.
Plaster costs more because it takes more time, more skill, and more coats to apply correctly. Expect to pay $40 to $70 per square metre.
Winner: Drywall is more affordable for most commercial and residential projects.
Fire Resistance
Plaster is naturally fire resistant because of its density and lack of air gaps. When applied over masonry or metal lath, it forms a highly effective barrier against flames, which is why original plaster in heritage buildings is preserved rather than replaced during renovation.
Fire-rated drywall like Type X board achieves its rating through glass fibres added to the gypsum core. When exposed to heat, the core releases moisture as steam, slowing fire spread. It’s common in commercial builds nowadays and meets most Australian fire compliance requirements.
Soundproofing and Thermal Performance
Plaster’s density gives it a natural acoustic advantage. The mass of a solid plaster wall blocks sound transmission more effectively than standard drywall. That’s a real benefit in medical facilities, executive offices, and hotel suites.
From a thermal standpoint, plaster also outperforms standard drywall. Drywall has an R-value of around 0.5 per half-inch of thickness. Plaster doubles that, which means better insulation and sound absorption without needing additional acoustic products.
Winner: Plaster is better when it comes to soundproofing and thermal performance
Finish and Aesthetics
Plaster looks seamless with no visible joints. It can be smooth, textured, or shaped into decorative features like cornices, columns, and ceiling details.
Drywall also delivers a smooth finish once properly taped and sanded. While it looks clean, it doesn’t always match the depth and richness of a hand-applied plaster finish.
Winner: Plaster looks more premium
Read More: Why Do Cracks Form Around Windows in Plaster Walls? (Causes and Fixes)
Moisture Resistance
Plaster handles humidity well but can deteriorate if exposed to constant moisture or leaks. It performs best in dry internal environments.
Drywall has the edge here because of its specialised variants. Moisture-resistant boards are designed for bathrooms, laundries, and commercial kitchens. These boards perform better in controlled wet areas when installed correctly.
Winner: Moisture-resistant drywall; normal drywall doesn’t withstand moisture
Maintenance and Repairs
Plaster repairs take more skill because matching the original finish and texture requires experience. Done properly, a plaster repair blends in seamlessly. Done by the wrong person, it shows.
Drywall is easier to patch. Small dents and holes are quick to fix. Just cut out the damaged section, then replace the sheet, tape, fill, and paint. You can DIY basic drywall repairs.
Winner: Drywall
Plaster or Drywall for Your Project?
Get clear advice based on your space, budget, and timeline.
Which Is Right for Your Adelaide Renovation?
The right choice between plaster and drywall depends on how the space will be used and the finish you want. For most commercial projects in Adelaide, drywall is the best choice because it installs quickly and minimizes downtime for businesses.
Plaster is the better choice for heritage buildings and premium spaces where performance and finish matter.
If you’re not sure which system suits your project, Swart Plastering works across both plaster and drywall in Adelaide and all-around South Australia. Get in touch for a free quote and we’ll give you a straight answer based on what the job actually needs.
Plaster and Drywall Services in South Australia
Residential and commercial wall systems done properly from start to finish.
FAQs
Is plaster better than drywall for old homes?
Plaster works better in older homes because it matches solid wall construction and existing finishes. Drywall in an older home can look out of place next to original plaster features.
How long does plaster last?
Plaster can last for 50 to 60 years or sometimes even 100 years when it’s installed properly and kept dry. Many commercial and residential buildings across Adelaide still have original plaster in good condition.
Can drywall be used in wet areas?
Yes, moisture-resistant drywall is designed for bathrooms, laundries, and some commercial kitchen applications. Standard drywall should never go in wet areas. It will deteriorate quickly if it gets wet.
How do I know if my walls are plaster or drywall?
Tap the wall. Plaster sounds dense and solid, while drywall sounds hollow. It’s also thicker at over 25 mm and has no visible seams. Drywall, on the other hand, shows taped joints between panels.
Can you plaster over drywall?
Yes, and it’s common if you want a more solid, premium finish. The drywall surface needs to be properly prepared before plastering, but it works well and is faster than full wet plaster from scratch.
